GMC 1986 P-Truck Service Manual page 301

NOTICE: Failure to completely pack the wheel
bearing (cones, rollers, and cage) with grease
will result in premature wheel bearing damage
and/or wear.
4. F ill each w heel b e a rin g (cone and ro lle r
assembly) full of grease.
• Use a cone-type grease machine that forces
grease into the bearing.
• If a cone-type grease m achine is not
available, pack the wheel bearing by hand.
• When packing the wheel bearing by hand,
work the grease into the bearings between
the rollers, cones, and the cage.
5. Inner wheel bearing (73) into the hub/rotor (81).
• Put an a d d itio n a l q u a n tity of grease
outboard of this bearing.
6. New seal (72).
• Use a flat plate or block to install the seal to
insure it is flush with the hub/rotor flange.
• Lubricate the seal lip with a thin layer of
grease.
7. Hub/rotor (81).
• Do not damage the steering knuckle spindle
threads.
8. Outer wheel bearing (76).
• Slide it over the spindle until the wheel
bearing (76) fully seats against the hub/rotor
outer race (75).
NOTICE: Refer to "Notice" on page 3C#1 of
this section.
9. Washer (77), nut (78), and cotter pin (80).
• Do not place the cotter pin through the hole
in the spindle until the wheel bearings are
adjusted.
$ Tighten
• Nut (78) to 16 N m (12 ft. lbs.) while turning
the hub/rotor assembly in either direction.
10. Put an additional quantity of grease outboard of
the wheel bearing (76).
11. Adjust the wheel bearings.
• Refer to " Wheel Bearing Adjustment," in
this section.
12. Dust cap (79) on the hub/rotor (81).
13. Caliper. Refer to BRAKES (SEC. 5).
14. Tire and wheel assembly and lower the vehicle.
FRONT SUSPENSION 3C-15
WHEEL BEARING ADJUSTMENT
Important
• The proper functioning of the front suspension
cannot be maintained unless the front wheel
bearings are correctly adjusted. The bearings
must be a slip fit on the spindle and the inside
diameter of the wheel bearing must be lubricated
to ensure the bearings will creep. The spindle nut
(78) must have a free-running fit on the spindle
threads.
NOTICE: Never preload the front wheel
bearings. Damage can result by the steady
thrust on the roller ends which comes from
preloading.
f t
Adjust
• Raise the vehicle and support it with suitable
safety stands under the lower control arms.
1. Remove the dust cap (79) from the hub/rotor (81).
2. Remove the cotter pin (80).
Tighten
• Nut (78) to 16 N m (12 ft. lbs.) while rotating the
wheel and tire assembly (this will seat the
bearings).
3. Back off the nut (78) to the " just loose" position.
4. Hand tighten the nut (78).
5. Back off the nut (78) until the hole in the spindle
lines up with a slot on the nut.
• Do not back off more than V
6. New cotter pin (80).
• Make sure the bent ends do not interfere
with the dust cap (79).
Measure
• Endplay in the hub/rotor assembly (81).
• It should measure between 0.03 mm (0.0012
inches) and 0.13 mm (0.005 inches) when properly
adjusted.
7. Install the dust cap (79) on the hub/rotor (81).
8. Install the wheel and tire assembly if removed
and lower the vehicle.
of a flat.
2